Implant having adjustable filament coils

ABSTRACT

A device having one or more adjustable loops or coils associated with an implant body for use in soft tissue reconstructions is provided. One exemplary embodiment of a device includes a body and a suture filament, with the filament being used to form a self-locking sliding knot disposed on a top side of the body and a plurality of adjustable coils that are substantially disposed on the body&#39;s bottom side. Terminal ends of the filament located above the body&#39;s top side can be passed through an opening of a Lark&#39;s Head knot from opposite sides, thus forming a self-locking sliding knot, and then the terminal ends can be tensioned to adjust a circumference of the coils. Changing a coil&#39;s circumference changes a location of a ligament graft disposed on the coil. Other configurations of devices and systems, as well as methods for performing ACL repairs, are also provided.

FIELD

The present disclosure relates to devices, systems, and methods forsecuring soft tissue to bone, and more particularly it relates tosecuring an ACL graft to a femur.

BACKGROUND

Joint injuries may commonly result in the complete or partial detachmentof ligaments, tendons, and soft tissues from bone. Tissue detachment mayoccur in many ways, e.g., as the result of an accident such as a fall,overexertion during a work related activity, during the course of anathletic event, or in any one of many other situations and/oractivities. These types of injuries are generally the result of excessstress or extraordinary forces being placed upon the tissues.

In the case of a partial detachment, commonly referred to under thegeneral term “sprain,” the injury frequently heals without medicalintervention, the patient rests, and care is taken not to expose theinjury to undue strenuous activities during the healing process. If,however, the ligament or tendon is completely detached from itsattachment site on an associated bone or bones, or if it is severed asthe result of a traumatic injury, surgical intervention may be necessaryto restore full function to the injured joint. A number of conventionalsurgical procedures exist for re-attaching such tendons and ligaments tobone.

One such procedure involves forming aligned femoral and tibial tunnelsin a knee to repair a damaged anterior cruciate ligament (“ACL”). In oneACL repair procedure, a ligament graft is associated with a surgicalimplant and secured to the femur. A common ACL femoral fixation meansincludes an elongate “button,” sometimes referred to as a corticalbutton. The cortical button is attached to a suture loop that is sizedto allow an adequate length of a soft tissue graft to lie within thefemoral tunnel while providing secure extra-cortical fixation.

Existing devices and methods can be limited because they do not alwaysprovide the desired strength. In some instances, one or more knots tiedto help maintain a location of the suture loop with respect to acortical button, and thus the graft associated therewith, can loosen orslip. Thus, even if a ligament graft is disposed at a desired locationduring a procedure, post-operatively the circumference of the loop canincrease, causing the graft to move away from the desired location.Further, it can be desirable to limit the number of knots used inconjunction with such devices, because of the potential for the knotsloosening and because the additional surface area knots can increase therisk of trauma. Still further, existing devices and methods also lackadjustability in many instances. For example, in procedures in whichmultiple ligament grafts are associated with the cortical button, it canbe difficult to control placement of one ligament graft without alsomoving the other ligament graft.

Accordingly, it is desirable to provide devices, systems, and methodsthat improve the strength and adjustability of surgical implants used inconjunction with ligament graft insertion, and to minimize the number ofknots associated with maintaining a location of the grafts once thegrafts are disposed at desired locations.

SUMMARY

Devices, systems, and methods are generally provided for performing ACLrepairs. In one exemplary embodiment, a surgical implant includes a bodyhaving a plurality of thru-holes and a suture filament extending throughthe body. The filament can be configured to form a knot and a pluralityof coils, with the knot being located on a top side of the body and aportion of each coil being disposed on both the top side of the body anda bottom side of the body as a result of the filament being disposedthrough at least two of the plurality of thru-holes of the body. Theknot can be a self-locking knot, with the self-locking knot defining acollapsible opening. The knot can have a portion of the suture filamentthat is intermediate its first terminal end and the plurality of coilsand is disposed on the top side of the body passed through thecollapsible opening from a first side of the opening. Further, the knotcan have a portion of the suture filament that is intermediate itssecond terminal end and the plurality of coils and disposed on the topside of the body passed through the collapsible opening from a second,opposite side of the opening. In some embodiments, the collapsibleopening can be configured to collapse and move toward the body whentension is applied to at least one of the first and second terminalends.

The plurality of coils can include a first coil and a second coil formedby a first portion of the filament extending between the self-lockingknot and the first terminal end, and a third coil and a fourth coilformed by a second portion of the filament extending between theself-locking knot and the second terminal end. In some embodiments thethru-holes of the body include two outer thru-holes and two innerthru-holes, with each outer thru-hole being located adjacent torespective opposed terminal ends of the body and the inner thru-holesbeing disposed between the outer thru-holes. In such embodiments, thefirst and third coils can pass through each of the outer thru-holes andthe second and fourth coils can pass through each of the innerthru-holes. Alternatively, in such embodiments, the first, second,third, and fourth coils can all pass through each of the innerthru-holes. At least one coil can be configured such that itscircumference can be changed by applying tension to at least one of thefirst and second terminal ends. In some embodiments the plurality ofcoils can be configured such that a circumference of one coil can beadjusted independent from adjusting a circumference of another coil.

The self-locking knot can include a Lark's Head knot. The Lark's Headknot can have certain modifications or additions to allow it to beself-locking, as described in greater detail herein. In some embodimentsthe implant can include a second suture filament extendinglongitudinally through the body. The second suture filament can passthrough each thru-hole of the plurality of thru-holes, and can be used,for example, as a shuttle to help guide the implant through a bonetunnel.

A sleeve can be included as part of the implant. A sleeve can bedisposed over a first portion of the suture filament that extendsbetween the self-locking knot and the first terminal end, and a sleevecan be disposed over a second portion of the suture filament thatextends between the self-locking knot and the second terminal end, witheach sleeve being located on the top side of the body. In someembodiments the sleeve disposed over the first portion and the sleevedisposed over the second portion can be the same sleeve, with a portionof that sleeve being disposed around the bottom side of the body.

Another exemplary embodiment of a surgical implant includes a bodyhaving a plurality of thru-holes formed therein and a suture filamentattached to the body such that the filament has a first terminal end, asecond terminal end, and a Lark's Head knot formed therein, all of whichare located on a top side of the body. The suture filament can bearranged with respect to the body such that a first portion of thefilament extending between the Lark's Head knot and the first terminalend passes through one thru-hole to a bottom side of the body andthrough a different thru-hole to the top side of the body to form afirst loop. Similarly, a second portion of the filament extendingbetween the Lark's Head knot and the second terminal end passes throughone thru-hole to the bottom side of the body and through a differentthru-hole to the top side of the body to form a second loop. Further,the first terminal end can pass through an opening defined by the Lark'sHead knot from a first side of the opening and the second terminal endcan pass through the same opening from a second, opposite side of theopening.

In some embodiments, additional loops can be formed from the suturefilament. For example, the suture filament can be arranged with respectto the body such that its first portion passes through one thru-hole tothe bottom side of the body and through a different thru-hole to the topside to form a third loop, while its second portion passes through onethru-hole to the bottom side of the body and through a differentthru-hole to the top side to form a fourth loop. In some embodiments thethru-holes of the body include two outer thru-holes and two innerthru-holes, with each outer thru-hole being located on an outer portionof the body and the inner thru-holes being disposed between the outerthru-holes. In such embodiments, the first and second portions of thesuture filament can pass through each of the outer thru-holes andthrough each of the inner thru-holes at least once. Alternatively, insuch embodiments, the first and second portions of the suture filamentcan pass through each of the inner thru-holes at least twice. A lengthof the filament's first portion and a length of the filament's secondportion can be adjustable. In some embodiments the implant can include asecond suture filament extending longitudinally through the body. Thesecond suture filament can pass through each thru-hole of the pluralityof thru-holes, and can be used, for example, as a shuttle to help guidethe implant through a bone tunnel.

One exemplary embodiment of a surgical method includes loading a graftonto one or more coils of a plurality of coils of an implant filamentthat is coupled to an implant body, pulling a leading end of a shuttlefilament that is disposed through the implant body through a bone tunneluntil the implant body is pulled out of the tunnel while at least aportion of the implant filament and the graft remain in the tunnel, andorienting the implant body so that its bottom side is facing the bonetunnel through which the implant body passed. Pulling the leading end ofthe shuttle filament also necessarily pulls the implant body, theimplant filament, and the graft through the tunnel. The resultingorientation of the implant's bottom side facing the tunnel is such thatthe plurality of coils are disposed substantially within the tunnel anda sliding knot first and second terminal ends of the implant filamentare located outside of the tunnel, adjacent to a top side of the implantbody.

In some embodiments, the step of orienting the implant body can beperformed by pulling a trailing end of the shuttle filament.Alternatively, the step of orienting the implant body can be performedby pulling both the leading and trailing ends of the shuttle filament.The method can further include selectively applying tension to at leastone of the first and second terminal ends to adjust a circumference ofone or more of the coils.

BRIEF DESCRIPTION OF DRAWINGS

This invention will be more fully understood from the following detaileddescription taken in conjunction with the accompanying drawings, inwhich:

FIG. 1A is a schematic view of components of one exemplary embodiment ofa surgical implant, including a cortical button and a suture filamenthaving a Lark's Head knot formed therein;

FIG. 1B is a perspective side view of one exemplary embodiment of asurgical implant formed using the cortical button and suture filament ofFIG. 1A;

FIG. 2A is a top perspective view of the cortical button of FIG. 1A;

FIG. 2B is an end elevational view of the cortical button of FIG. 2A;

FIG. 2C is a side elevational view of the cortical button of FIG. 2A;

FIGS. 3A-3E are sequential views illustrating one exemplary embodimentfor forming the Lark's Head knot of FIG. 1A;

FIG. 4 is a schematic side cross-sectional view of one exemplaryembodiment of a surgical implant;

FIG. 5 is a schematic side cross-sectional view of another exemplaryembodiment of a surgical implant;

FIGS. 6A-6B are sequential view of yet another exemplary embodiment of asurgical implant, the implant having grafts associated therewith,illustrating selective movement of the grafts;

FIGS. 7A-7E are sequential views illustrating one exemplary embodimentof coupling a suture to a cortical button to form a surgical implant;

FIGS. 8A-8H are sequential views illustrating another exemplaryembodiment of coupling a suture to a cortical button to form a surgicalimplant, and associating a graft therewith;

FIG. 9 is a side perspective view of another exemplary embodiment of asurgical implant;

FIG. 10 is a side perspective view of one exemplary embodiment of asurgical implant associated with a shuttle filament;

FIG. 11A is a schematic side cross-sectional view of another exemplaryembodiment of a surgical implant associated with a shuttle filament;

FIG. 11B is a top view of a body of the surgical implant of FIG. 11A;

FIG. 12A is a schematic side cross-sectional view of still anotherexemplary embodiment of a surgical implant associated with a shuttlefilament;

FIG. 12B is a top view of a body of the surgical implant of FIG. 12A;

FIG. 13A is a schematic view of a portion of one exemplary embodimentfor implanting a graft in a bone tunnel using a surgical implant havinga shuttle filament associated therewith;

FIG. 13B is a schematic view of the surgical implant of FIG. 12A for usein the exemplary embodiment for implanting a graft in a bone tunnel ofFIGS. 13A and 13D-H;

FIG. 13C is a schematic view of the surgical implant of FIG. 11A for usein the exemplary embodiment for implanting a graft in a bone tunnel ofFIGS. 13A and 13D-H;

FIGS. 13D-G are schematic, sequential views illustrating the remainderof the exemplary embodiment for implanting a graft in a bone tunnel ofFIG. 13A; and

FIG. 13H is a schematic view of a portion of another exemplaryembodiment for implanting a graft in a bone tunnel using a surgicalimplant having two, independently collapsible coils.

DETAILED DESCRIPTION

Certain exemplary embodiments will now be described to provide anoverall understanding of the principles of the structure, function,manufacture, and use of the devices and methods disclosed herein. One ormore examples of these embodiments are illustrated in the accompanyingdrawings. Those skilled in the art will understand that the devices andmethods specifically described herein and illustrated in theaccompanying drawings are non-limiting exemplary embodiments and thatthe scope of the present invention is defined solely by the claims. Thefeatures illustrated or described in connection with one exemplaryembodiment may be combined with the features of other embodiments. Suchmodifications and variations are intended to be included within thescope of the present invention. Further, in the present disclosure,like-numbered components of the embodiments generally have similarfeatures. Additionally, to the extent that linear or circular dimensionsare used in the description of the disclosed systems, devices, andmethods, such dimensions are not intended to limit the types of shapesthat can be used in conjunction with such systems, devices, and methods.A person skilled in the art will recognize that an equivalent to suchlinear and circular dimensions can easily be determined for anygeometric shape. Sizes and shapes of the systems and devices, and thecomponents thereof, can depend at least on the anatomy of the subject inwhich the systems and devices will be used, the size and shape ofcomponents with which the systems and devices will be used, and themethods and procedures in which the systems and devices will be used.

The figures provided herein are not necessarily to scale. Further, tothe extent arrows are used to describe a direction a component can betensioned or pulled, these arrows are illustrative and in no way limitthe direction the respective component can be tensioned or pulled. Aperson skilled in the art will recognize other ways and directions forcreating the desired tension or movement. Likewise, while in someembodiments movement of one component is described with respect toanother, a person skilled in the art will recognize that other movementsare possible. By way of non-limiting example, in embodiments in which asliding knot is used to help define a collapsible loop, a person skilledin the art will recognize that different knot configurations can changewhether moving the knot in one direction will cause a size of an openingdefined by the knot will increase or decrease. Additionally, a number ofterms may be used throughout the disclosure interchangeably but will beunderstood by a person skilled in the art. By way of non-limitingexample, the terms “suture” and “filament” may be used interchangeably.

The present disclosure generally relates to a surgical implant for usein surgical procedures such as ACL repairs. The implant can include abody having thru-holes formed therein and a suture filament associatedtherewith. An exemplary embodiment of a body 10 and a suture filament 50illustrated separately is shown in FIG. 1A, while an exemplaryembodiment of the two components coupled together to form an implant 100is shown in FIG. 1B. The suture filament 50 can form a self-locking knot52, illustrated as including a Lark's Head knot in FIG. 1A, and firstand second tails 54, 55 extending therefrom can be passed throughthru-holes 24 formed in the body 10 to associate the two components. Asdescribed below, the self-locking knot 52 is actually a Lark's Head knotmodified to make it self-locking.

While the particulars of the formation of the construct illustrated inFIG. 1B are discussed in greater detail below, as shown the self-lockingknot 52 can be formed on a first, top side 10 a of the body 10 and aplurality of coils 60 formed from the first and second tails 54, 55extending from the self-locking knot 52 can be disposed on a second,bottom side 10 b of the body 10. First and second terminal ends 54 t, 55t of the first and second tails 54, 55 can be passed through acollapsible opening 56 (FIGS. 4 and 5) of the self-locking knot 52before the knot 52 is collapsed, with the second terminal end 55 tpassing through the collapsible opening 56 from a first side 56 a of theopening 56, and the first terminal end 54 t passing through thecollapsible opening 56 from a second, opposite side 56 b of the opening56. As shown, the terminal ends 54 t, 55 t can extend proximally fromthe self-locking knot 52, and the collapsible opening 56 can beconfigured to collapse and move toward the body 10 when tension isapplied to at least one of the terminal ends 54 t, 55 t. Applyingtension to the terminal ends 54 t, 55 t can also selectively adjust acircumference of one or more of the coils 60 without adjusting acircumference of all of the coils 60. Optionally, a sleeve 58 can beassociated with one or both of the tail portions extending between theself-locking knot 52 and the first and second terminal ends 54 t, 55 t.The sleeve 58 can help prevent the tails 54, 55 from being cut too closeto the knot 52 after a desired implant location is achieved.

A body 10 for use as a part of a surgical implant to fixate a ligamentgraft in bone is illustrated in FIGS. 2A-2C. The body 10 can have asomewhat rectangular, elongate shape with curved leading and trailingterminal ends 16, 18. A plurality of thru-holes 24 can extend from afirst, top surface 20 and through a second, bottom surface 22. In theillustrated embodiment there are two outer thru-holes 24 a, 24 ddisposed, respectively, adjacent to leading and trailing terminal ends16, 18, and two inner thru-holes 24 b, 24 c disposed between the twoouter holes 24 a, 24 d. As shown, the outer and inner thru-holes 24 a,24 d and 24 b, 24 c have diameters that are substantially the same, anda space separating adjacent thru-holes 24 is substantially the same foreach adjacent pair. A width W of the body 10 is defined by the distancebetween the two elongate sidewalls 12, 14, as shown in FIG. 2B, a lengthL of the body 10 is defined by the distance between central portions 16c, 18 c of the end walls of the leading and trailing terminal ends 16,18, as shown in FIG. 2C, and a thickness T of the body 10 is defined bythe distance between the top and bottom surfaces 20, 22, as shown inFIGS. 2B and 2C. The body 10 can generally be referred to as a corticalbutton, among other known terms.

A person skilled in the art will recognize that the body 10 describedherein is merely one example of a body that can be used in conjunctionwith the teachings provided herein. A body configured to be associatedwith a suture filament of the type described herein can have a varietyof different shapes, sizes, and features, and can be made of a varietyof different materials, depending, at least in part, on the othercomponents with which it is used, such as the suture filament and theligament graft, and the type of procedure in which it is used. Thus,while in the present embodiment the body 10 is somewhat rectangularhaving curved ends, in other embodiments the body can be substantiallytubular, among other shapes.

In one exemplary embodiment of the substantially rectangular button, thelength L of the body is in the range of about 5 millimeters to about 30millimeters, the width W is in the range of about 1 millimeter to about10 millimeters, and the thickness T is in the range of about 0.25millimeters to about 3 millimeters. In one exemplary embodiment, thelength L can be about 12 millimeters, the width W can be about 4millimeters, and the thickness T can be about 1.5 millimeters. Diametersof the thru-holes 24 can be in the range of about 0.5 millimeters toabout 5 millimeters, and in one exemplary embodiment each can be about 2millimeters. Although in the illustrated embodiment each of thethru-holes 24 a, 24 b, 24 c, 24 d has a substantially similar diameter,in other embodiments some of the thru-holes can have differentdiameters. Additionally, any number of thru-holes can be formed in thebody 10, including as few as two.

In exemplary embodiments the body 10 can be made from a stainless steelor titanium, but any number of polymers, metals, or other biocompatiblematerials in general can be used to form the body. Some non-limitingexamples of biocompatible materials suitable for forming the bodyinclude a polyether ether ketone (PEEK), bioabsorbable elastomers,copolymers such as polylactic acid-polyglycolic acid (PLA-PGA), andbioabsorbable polymers such as polylactic acid. The implant can also beformed of absorbable and non-absorbable materials. Other exemplaryembodiments of a body or cortical button that can be used in conjunctionwith the teachings herein are described at least in U.S. Pat. No.5,306,301 of Graf et al., the content of which is incorporated byreference herein in its entirety.

Steps for configuring the suture filament 50 for use as a part of thesurgical implant 100 to fixate a ligament graft in bone are illustratedin FIGS. 3A-3E. As shown in FIG. 3A, the filament can be foldedsubstantially in half at an approximate midpoint 50 m of the filament50, forming a first filament limb 54 and a second filament limb 55having first and second terminal ends 54 t and 55 t, respectively. Acentral portion 50 c of the filament 50, which includes the midpoint 50m, can be folded toward the first and second limbs 54, 55, as shown inFIG. 3B, and be brought proximate to the first and second limbs 54, 55.This results in the formation of a first secondary loop 57 and a secondsecondary loop 59, as shown in FIG. 3C. A size of the secondary loops57, 59, and a length of the limbs 54, 55 extending therefrom, can beadjusted as desired.

As shown in FIG. 3D, a portion 54 p, 55 p of the first and second limbs54, 55 that are part of the secondary loops 57, 59 can be grasped andpulled upward (as shown, “out of the page”). This results in theconfiguration illustrated in FIG. 3E, a filament having a Lark Head'sknot 52 formed therein with first and second filament limbs 54, 55having terminal ends 54 t, 55 t extending therefrom. The Lark's Headknot 52 defines a collapsible opening 56, a size of which can bedecreased by applying a force in an approximate direction A to one orboth of the limbs 54, 55 extending from the knot 52, or by applying aforce in an approximate direction B to the opening 56. Likewise, a sizeof the opening 56 can be increased by grasping near the midpoint 50 m ofthe filament 50 to hold the portion where the fold is formedapproximately stationary and then applying either a force in theapproximate direction B to both of the limbs 54, 55 extending from theknot 52, or a force in the approximate direction B to the opening 56. Asdescribed in greater detail below, the Lark's Head knot can be modifiedto form a self-locking knot.

A person skilled in the art will recognize other ways by which a Lark'sHead knot can be formed. Similarly, a person skilled in the art will befamiliar with other types of knots that can be formed in suturefilaments, and will understand ways in which other knots can be adaptedfor use in a manner as the Lark's Head knot is used in the presentdisclosure. The present disclosure is not limited to use only with aLark's Head knot.

The suture filament 50 can be an elongate filament, and a variety ofdifferent types of suture filaments can be used, including but notlimited to a cannulated filament, a braided filament, and a monofilament. The type, size, and strength of the filament can depend, atleast in part, on the other materials of the implant, including thematerial(s) of the cortical button and the ligament graft, the tissue,bone, and related tunnels through which it will be passed, and the typeof procedure in which it is used. In one exemplary embodiment thefilament is a #0 filament (about 26 gauge to about 27 gauge), such as anOrthocord™ filament that is commercially available from DePuy Mitek,LLC., 325 Paramount Drive, Raynham, Mass. 02767, or an Ethibond™filament that is commercially available from Ethicon, Inc., Route 22West, Somerville, N.J. 08876. The thickness of the filament shouldprovide strength in the connection but at the same time minimize thetrauma caused to tissue through which it passes. In some embodiments thefilament can have a size in the range of about a #5 filament (about 20gauge to about 21 gauge) to about a #3-0 filament (about 29 gauge toabout 32 gauge). Orthocord™ suture is approximately fifty-five tosixty-five percent PDS™ polydioxanone, which is bioabsorbable, and theremaining thirty-five to forty-five percent ultra high molecular weightpolyethylene, while Ethibond™ suture is primarily high strengthpolyester. The amount and type of bioabsorbable material, if any,utilized in the filaments of the present disclosure is primarily amatter of surgeon preference for the particular surgical procedure to beperformed. In some exemplary embodiments, a length of the filament canbe in the range of about 0.2 meters to about 5 meters, and in oneembodiment it has a length of about 1.5 meters.

FIG. 4 illustrates one exemplary embodiment of the suture filament 50being associated with the body 10 to form a surgical implant 100′. Asshown, the Lark's Head knot 52 is disposed on a first, top side 10 a ofthe body 10, and the limbs 54, 55 extending therefrom are used toassociate the filament 50 with the body 10. The limbs 54, 55 can beselectively passed through one of the thru-holes 24 to a bottom side 10b of the body 10, and then through another of the thru-holes 24 back tothe top side 10 a. In the illustrated embodiment, the first limb 54passes through the second thru-hole 24 b to reach the bottom side 10 band then through the third thru-hole 24 c to reach the top side 10 a,while the second limb 55 passes through the third thru-hole 24 c toreach the bottom side 10 b and then through the second thru-hole 24 b toreach the top side 10 a, forming a coil or loop 60 a of the first limb54 and a coil or loop 60 b of the second limb 55. The terminal ends 54t, 55 t of the limbs 54, 55 can then be passed through the opening 56defined by the Lark's Head knot 52. As shown, the terminal end 54 t canbe passed from the second side 56 b of the opening 56, as shown a rightside, through the opening 56, and to a first side 56 a of the opening56, as shown a left side, while the terminal end 55 t can be passed fromthe first side 56 a, through the opening 56, and to the second, oppositeside 56 b. The limbs 54, 55 can continue to be pulled through theopening 56 until a desired coil size for each of the first and secondlimbs 54, 55 is achieved. In alternative embodiments, one or both of thelimbs 54, 55 can be passed through the opening 56 multiple times beforeusing the limbs 54, 55 to adjust the coils 60 to the desired size.

Once the terminal ends 54 t, 55 t have been passed through the opening56 and the desired coil size has been achieved, the opening 56 can becollapsed. One way that the opening 56 can be collapsed is by applying aforce to the terminal ends 54 t, 55 t in an approximate direction C asshown, while also applying a counterforce to the coils 60 toapproximately maintain the circumference of the coils. Without thecounterforce, the force in the approximate direction C would typicallydecrease the circumference of the coils 60 before collapsing the opening56. Because the terminal ends 54 t, 55 t are passed through opposingsides 56 a, 56 b of the opening 56, and compression of the Lark's Headknot 52 against a top surface 20 of the body 10 creates resistanceagainst loosening, the resulting collapsed knot is self-locking, meaningthe Lark's Head knot 52 is a sliding knot that locks itself without theaid of additional half-hitches or other techniques known to help securea location of a knot with respect to the body 10.

After the opening 56 is collapsed, a circumference of the coils 60 canagain be decreased by applying force to the terminal ends 54 t, 55 t inthe approximate direction C with the first terminal end 54 t generallycontrolling the size of the coil 60 a and the second terminal end 55 tgenerally controlling the size of the coil 60 b. Because the collapsibleopening 56 is self-locking, it can be more difficult to increase acircumference of the coils 60 a, 60 b after the opening 56 is collapsed.However, a person skilled in the art will understand how portions of thefilament 50 that form the collapsible knot 52 can be manipulated toallow for increases in the circumference of the coils 60 a, 60 b.

In other embodiments, more than one coil can be formed by the first orsecond filament limbs. One exemplary embodiment of such an implant 100″is shown in FIG. 5. Similar to the implant 100′, the Lark's Head knot 52is disposed on the top side 10 a of the body 10, and the limbs 54, 55extending therefrom are selectively passed through multiple thru-holes24 of the body 10 to associate the filament 50 with the body 10. In theillustrated embodiment, the first limb 54 passes distally through thesecond hole 24 b to the bottom side 10 b of the body 10, and through thethird thru-hole 24 c back to the top side 10 a twice to form a firstcoil 60 a and a second coil 60 c before it is then passed through theopening 56 defined by the Lark's Head knot 52 from the second side 56 bof the opening 56 to the first side 56 a. Similarly, the second limb 55passes distally through the third hole 24 c to the bottom side 10 b, andthrough the second thru-hole 24 b back to the top side 10 a twice toform a first coil 60 b and a second coil 60 d before it is then passedthrough the opening 56 from the first side 56 a to the second side 56 b.The opening 56 can be collapsed, and a circumference of the first andsecond coils 60 a, 60 c can be adjusted by the terminal end 54 t and thefirst and second coils 60 b, 60 d can be adjusted by the terminal end 55t in manners similar to those described above with respect to the device100′. The inclusion of a second coil formed from the limbs 54, 55increases the strength of the implant 100″ due to a pulley effect,allowing the implant 100″ to be more stable when it is implanted in boneand to more stably hold a ligament graft attached to one or more of thecoils 60.

Any number of coils can be formed from the first and second limbs 54,55, and the number of coils formed in the first limb 54 does not have tobe the same number of coils formed in the second limb 55. In someexemplary embodiments, three or four coils can be formed in one or bothof the limbs. Further, the limbs used to form the coils can be passedthrough any number of thru-holes formed in the body 10. The first limb54 does not need to pass through the same thru-holes through which thesecond limb 55 passes. Accordingly, by way of non-limiting example, acoil of the first limb 54 can be formed by passing the limb through thefirst thru-hole 24 a and then back through the fourth thru-hole 24 d anda coil of the second limb 55 can be formed by passing the limb throughthe third thru-hole 24 c and then back through the second thru-hole 24b. By way of further non-limiting example, a coil of the first limb 54can be formed by passing the limb through the second thru-hole 24 b andthen back through the fourth thru-hole 24 d and a coil of the secondlimb 55 can be formed by passing the limb through the third thru-hole 24c and then back through the second-thru hole 24 b.

Likewise, when multiple coils are formed in one limb, that limb does nothave to be passed through the same thru-holes to form each coil.Accordingly, by way of non-limiting example, a first coil of the firstlimb 54 can be formed by passing the limb through the second thru-hole24 b and then back through the third thru-hole 24 c and a second coil ofthe first limb 54 can be formed by passing the limb through the firstthru-hole 24 a and then back through the fourth thru-hole 24 d. By wayof further non-limiting example, a first coil of the second limb 55 canbe formed by passing the limb through the fourth thru-hole 24 d and thenback through the first thru-hole 24 a and a second coil of the secondlimb 55 can be formed by passing the limb through the fourth thru-hole24 d and then back through the second thru-hole 24 b. In yet one furthernon-limiting example, a coil of the first limb 54 can be passed throughthe second thru-hole 24 b and then back through the second thru-hole 24b and a coil of the second limb 55 can be passed through the thirdthru-hole 34 c and then back through the third thru-hole 24 c, with thefirst limb 54 and the second limb 55 intersecting at least once on thebottom side 10 b so that the limbs 54, 55 remain on the bottom side 10 bwhen they are passed back through the same thru-hole they came to reachthe bottom side 10 b in the first place. A person skilled in the artwill recognize a number of configurations between the filament andthru-holes that can be used to form one or more coils in the filamentlimbs before disposing terminal ends of the limbs through a collapsibleopening of a knot to create a self-locking knot.

A variety of tests were performed to assess the strength and integrityof an implant having a self-locking knot and four coils like some of theembodiments provided for herein. In particular, the tests were performedon the implant 100 shown in FIG. 2, with the filament being a braided #2ultra high molecular weight polyethylene suture with a loopcircumference of approximately 40 millimeters. Three separate cycletests of varying length were performed. Generally, a cyclical load wasapplied to the implant 100 a plurality of times, with the load cyclingbetween about 50 Newtons and about 250 Newtons. After a certain numberof cycles were performed, the distance a graft migrated from itsoriginal position was measured. After 10 cycles a displacement of theimplant 100 was about 1.0 mm, after 750 cycles a displacement of theimplant was about 1.4 millimeters, and after 1000 cycles a displacementof the implant was about 1.4 millimeters. Further details about testingprotocols of this nature can be found in an article written by Kamelgeret al., entitled “Suspensory Fixation of Grafts in Anterior CruciateLigament Reconstruction: A Biomechanical Comparison of 3 Implants,”published in Arthroscopy, Jul. 25, 2009, pp. 767-776, and in an articlewritten by Petre et al., entitled “Femoral Cortical Suspension Devicesfor Soft Tissue Anterior Cruciate Ligament Reconstruction,” published inThe American Journal of Sports Medicine, February 2013, pp. 416-422, thecontent of each which is incorporated by reference herein in itsentirety. A person skilled in the art will recognize that the testresults are dependent at least on the type and size of the filament ofthe implant.

Another test determined an ultimate failure load of the implant 100. Theultimate failure load measures the load at which the implant 100 fails.The ultimate failure load tested for the implant 100 was about 1322Newtons. During the ultimate failure load test, the displacement at 450Newtons was also measured, with displacement being about 2.0millimeters. Still another test performed on the implant was aregression stiffness test, which plots the displacement of the implantin comparison to the load and a slope of the initial line is measured.The implant 100 demonstrated a regression stiffness of about 775 Newtonsper millimeter. Again, a person skilled in the art will recognize thatthese test results are dependent at least on the type and size of thefilament of the implant.

FIGS. 6A and 6B illustrate the ability to selectively control some coils60 a′, 60 c′ of an implant 100′″ using one limb 54′ and other coils 60b′, 60 d′ of the implant 100′″ using the other limb 55′. As shown, theimplant 100′″ includes a single filament 50′ associated with a body 10′having a plurality of thru-holes 24′ formed therein. The configurationbetween the filament 50′ and the body 10′ is similar to the implants100, 100″ described above with respect to FIGS. 2 and 5. As shown, aself-locking knot 52′ is formed on a top side 10 a′ of the body 10′ andfour coils 60′ are formed from first and second limbs 54′, 55′ extendingfrom the self-locking knot 52′, the four coils 60′ being substantiallydisposed on a bottom side 10 b′ of the body 10′. Terminal ends 54 t′, 55t′ of the first and second limbs 54′, 55′ pass through an opening 56′ ofthe self-locking knot 52′ before the knot is collapsed, and can be usedto adjust a circumference of the coils 60′. In the illustratedembodiment, the first limb 54′ is differentiated from the second limb55′ by including markings on the first limb 54′. These visual indicatorsallow a surgeon to easily know which coils are controlled by whichlimbs, and can be added to the filament before or after the filament isassociated with the body 10′.

In the illustrated embodiment, a first ligament graft 102′ is coupled tofirst and second coils 60 a′, 60 c′ of the first limb 54′ by wrappingthe graft 102′ through each of the first and second coils 60 a′, 60 c′,and a second ligament graft 104′ is coupled to first and second coils 60b′, 60 d′ of the second limb 55′ by wrapping the graft 104′ through eachof the first and second coils 60 b′, 60 d′. As shown in FIGS. 6A and 6B,applying a force to the first limb 54′ in an approximate direction Ddecreases the circumference of the first and second coils 60 a′, 60 c′,thereby drawing the first ligament graft 102′ closer to the body 10′.More particularly, as tension is created by the force, the circumferenceof the diameter of the second coil 60 c′ decreases and advances thefirst graft 102′. As the distance between distal ends of the second coil60 c′ and the first coil 60 a′ increases, the weight of the graft 102′helps create a counterforce that maintains the circumference of thesecond coil diameter while the circumference of the first coil 60 a′decreases to catch-up to the second coil 60 c′ and the graft 102′. Aperson skilled in the art will understand how the application of variousforces and tensions to the first and second limbs 54′, 55′, the firstand second coils 60 a′, 60 c′ and 60 b′, 60 d′, and the first and secondgrafts 102′, 104′ associated therewith can be manipulated to selectivelyadjust locations of the grafts 102′, 104′ with respect to the body 10′.

As a result of this configuration, one ligament graft can be pulledcloser the body 10′ than another ligament graft. Such graftconfigurations can be useful to surgeons. By way of non-limitingexample, if during the course of a tissue repair the surgeonaccidentally amputated one of the hamstring tendons during harvesting orgraft preparation, the coils associated with one of the terminal endscan be adjusted so that the longer tendon is pulled deeper into thefemoral tunnel with the shorter tendon being more proximal of the longertendon, thus leaving more graft for the tibial tunnel. By way of furthernon-limiting example, grafts can be independently tensioned such thatthey are tightest at different angles of knee flexion, which can providesuperior biomechanics due to the repair being more anatomic. Otherconfigurations that can permit selective, independent tightening of thecoils formed in the suture filament can also be used while maintainingthe spirit of the present disclosure. For example, two separate knot orfinger-trap mechanisms can be disposed through the same thru-holes inthe button to permit selective, independent control of the coils.

Two non-limiting alternative embodiments for associating a suturefilament 150, 250 with a cortical button 110, 210 to form an implant200, 300 are illustrated in FIGS. 7A-7E and FIGS. 8A-8H, respectively.Starting first with FIGS. 7A-7E, the cortical button 110 includes fourthru-holes 124 disposed therein and the suture filament 150 is a braidedsuture. After forming a pretzel-shaped knot 152 using techniques knownto those skilled in the art, first and second terminal ends 154 t, 155 tof the filament 150 can be passed through the two interior thru-holes124 of the body 110, as illustrated in FIG. 7A, to form two loops orcoils 160 a, 160 b for receiving a ligament graft. In this embodiment,both the first and second limbs 154, 155 pass through the same interiorthru-hole 124 to pass from a top side 110 a to a bottom side 110 b ofthe body 110. Likewise, both limbs 154, 155 pass through the sameinterior thru-hole 124 to pass from the bottom side 110 b back to thetop side 110 a.

As shown in FIG. 7B, the terminal ends 154 t, 155 t can be passedthrough openings of the pretzel-shaped knot 152. Other suitable slidingknots can be used in lieu of a pretzel-shaped knot. Subsequently, aforce can be applied to the terminal ends 154 t, 155 t in an approximatedirection E to collapse and advance the knot 152 towards a top surface120 of the body 110, as shown in FIG. 7C. The pretzel knot 152 is notgenerally self-locking. Accordingly, as shown in FIG. 7D, one or morehalf-hitches 161 can be formed in the terminal ends 154 t, 155 t tosecure and lock a location of the collapsed pretzel knot 152 withrespect to the body 110. A graft 202 can then be disposed withinopenings of the coils 160 a, 160 b formed by the first and second limbs154, 155, as shown in FIG. 7E.

Tests performed using an implant like the embodiment shown in FIG. 7E,the filament being a braided #5 ultra high molecular weight polyethylenesuture with a loop circumference of approximately 40 millimeters,yielded a 10^(th) cycle displacement of approximately 1.9 millimeters, a750^(th) cycle displacement of approximately 2.2 millimeters, and a1000^(th) cycle displacement of approximately 2.3 millimeters. Theultimate failure load was measured to be approximately 1521 Newtons.Displacement at a load of 800 Newtons was measured to be approximately4.1 millimeters. Meanwhile, the regression stiffness was determined tobe approximately 267 Newtons per millimeter. A person skilled in the artwill recognize that the test results are dependent at least on the typeand size of the filament of the implant.

The embodiment illustrated in FIGS. 8A-8H also include a cortical button210 having at least three thru-holes 224 a, 224 b, 224 c disposedtherein and a suture filament 250 that is a braided suture associatedwith the button 210 to form an implant 300. As shown in FIG. 8A, aterminal end 254 t of a first limb 254 is passed from a top side 210 ato a bottom side 210 b of the body 210 through one of the thru-holes 224a and a terminal end 255 t of a second limb 255 is passed from the topside 210 a to the bottom side 210 b through another thru-hole 224 b. Thetwo terminal ends 254 t, 255 t are then both passed back to the top side210 a through the third thru-hole 224 c, as shown in FIG. 8B. Theresulting configuration is a first loop 263 formed on the top side 210 afrom a central portion 250 c of the filament 250 at an approximatemidpoint 250 m of the filament 250, and first and second coils 260 a,260 b primarily located below the bottom side 210 b.

As shown in FIG. 8C, the terminal ends 254 t, 255 t can be formed into asliding knot 252 such as a Buntline Hitch knot using techniques known tothose skilled in the art. Other suitable sliding knots can be used inlieu of the Buntline Hitch knot. A force can then be applied in anapproximate direction F to the terminal ends to tighten the BuntlineHitch knot, and as shown in FIG. 8D, the stationary terminal end, asshown the terminal end 254 t, can be cut so that it is substantiallyshorter than the sliding terminal end extending proximally from thetightened sliding knot 252, as shown the terminal end 255 t. The thirdthru-hole 224 c can be sized such that the Buntline Hitch knot is toobig to pass through it. Thus, a force in an approximate direction G canbe applied to the longer sliding terminal end 255 t to advance the knot252 toward the body 210, and to collapse the first loop 263 against thetop surface 220 of the body 210, as shown in FIG. 8E.

Optionally, a secondary loop 280 can be added to the first and secondcoils 260 a, 260 b, as shown in FIG. 8F. As shown, the secondary loop280 is a closed, fixed loop having an approximately fixed circumference.The secondary loop 280 can be formed using any number of techniquesknown to those skilled in the art, but in the illustrated embodiment thesecondary loop is disposed around the first and second coils 260 a, 260b and tied together to form the closed, fixed loop. As shown in FIG. 8G,a ligament graft 302 can be disposed around the secondary loop 280.While in other embodiments the ligament graft was only disposed aroundthe loop once, FIG. 8G illustrates that ligament grafts 302 can bedisposed around a filament in any of the embodiments described hereinmultiple times. A force in an approximate direction H can then beapplied to the long remaining terminal end 255 t to decrease thecircumference of the first and second coils 260 a, 260 b and advance theligament graft 302 closer to the body 210, as shown in FIG. 8H.

In the embodiment illustrated in FIGS. 8A-8H, the ligament graft is notattached directly to coils 260 a, 260 b formed by the filament 250, butinstead is coupled to the secondary loop 280. Such a secondary loop canbe used in any of the embodiments described or derivable fromdisclosures made herein. In some embodiments the secondary loop can helpminimize accidental graft damage due to wear with the main suturefilament when the circumferences of the coils of the main filament areadjusted.

In some embodiments, including but not limited to those implants havinga self-locking knot, a sleeve or spacer can be disposed over a portionof the first and second limbs on the top side of the body, adjacent tothe top surface. The optional sleeve can assist in preventing a surgeonfrom cutting terminal ends of the limbs extending proximally from theknot too close to the body. The integrity of the knot, and thus thestrength of the implant, can be compromised when the terminal ends ofthe limbs are cut too close to the body. The sleeve can generally haveelastic properties such that it bunches as compressive forces areapplied, and a surgeon can then cut the terminal ends at a locationproximal of the sleeve.

As shown in FIG. 9, in one exemplary embodiment of an implant 400 formedby a body 310 and a suture filament 350 forming both a self-locking knot352 on a top side 310 a of the body 310 and a plurality of coils 360substantially disposed on a bottom side 310 b of the body 310, sleeve358 is a single suture filament having a plurality of bores formedtherein to thread first and second limbs 354, 355 through the sleeve358. The sleeve 358 can be disposed around a portion of the first limb354 on the top side 310 a, wrap around a bottom surface 322 of the body310, and then wrap back around to the top side 310 a so it can bedisposed around a portion of the second limb 355. Wrapping the sleeve358 around the bottom surface 322 can help minimize proximal movement ofthe sleeve 358, toward the terminal ends 354 t, 355 t when the limbs354, 355 are tightened. The first terminal end 354 t passes into thesleeve 358 at a first bore 358 a and out of the sleeve at a second bore358 b, while the second terminal end 355 t passes into the sleeve 358 ata third bore 358 c and out of the sleeve at a fourth bore 358 d. Asshown, free ends 358 e, 358 f of the sleeve 358 can extend proximallyfrom the second and fourth bores 358 b, 358 d.

In other embodiments, the free ends 358 e, 358 f can be eliminated, orthe sleeve can be configured such that the free ends extend distally.The implant 100 of FIG. 1B is an example of an embodiment that does notinclude free ends. Rather, the first and second terminal ends passinto/out of the sleeve 58 at terminal ends 58 t ₁, 58 t ₂ of the sleeverather than at first and fourth bores. In still other embodiments,separate sleeves can be disposed on each of the first and second limbs.In such embodiments, the only bores formed in the sleeves may be thoseformed at the respective terminal ends, and thus the first and secondterminal ends of the filament can pass into and out of the sleevesthrough the terminal ends of the sleeves. In still further embodiments,the first and second terminal ends can extend through the same sleeve,or alternatively, free ends of the sleeve can be connected together toform a continuous loop. In addition to or in lieu of other sleeveconfigurations, other components configured to assist in allowing asurgeon to know where to cut the terminal ends after they are no longerneeded can also be incorporated into the implants described hereinwithout departing from the spirit of the disclosure.

The sleeve can be made from a wide variety of biocompatible flexiblematerials, including a flexible polymer, or it can be another filament.In one embodiment the sleeve is made of a polymeric material. In anotherembodiment, the sleeve is a flexible filament, such as a braided suture,for example Ethibond™ #5 filament. If the sleeve is formed from ahigh-strength suture such as Orthocord™ #2 filament, the braid can berelaxed by reducing the pick density. For example, Orthocord™ #2filament, which is typically braided at sixty picks per 2.54 centimeterscan be braided at approximately thirty to forty picks per 2.54centimeters, more preferably at about 36 picks per 2.54 centimeters. Ifthe sleeve material is formed about a core, preferably that core isremoved to facilitate insertion of the filament limbs, which maythemselves be formed of typical suture such as Orthocord™ #0 suture or#2 suture braided at sixty picks per 2.54 centimeters.

A length and diameter of the sleeve can depend, at least in part, on thesize and configuration of the components of the construct with which itis used and the surgical procedure in which it is used. In embodimentsin which the sleeve is a filament, a size of the sleeve can be in therange of about a #7 filament (about 18 gauge) to about a #2-0 filament(about 28 gauge), and in one embodiment the size can be about a #5filament (about 20 gauge to about 21 gauge). In addition, the sleeve canbe thickened by folding it upon itself coaxially, (i.e., sleeve in asleeve). A person having skill in the art will recognize comparablediameters that can be used in instances in which the sleeve is made of apolymeric or other non-filament material. In embodiments in which asingle sleeve is disposed over portions of both the first and secondterminal ends, a length of the sleeve can be in the range of about 1centimeter to about 12 centimeters, and in one embodiment the length canbe about 5.5 centimeters. In embodiments in which separate sleeves aredisposed over portions of the first and second terminal ends, a lengthof each sleeve can be in the range of about 0.5 centimeters to about 6centimeters, and in one embodiment each has a length of about 2.5centimeters. The axially compressible nature of the sleeves can be suchthat a length of the portion of the sleeve disposed on one of the limbscan compress fully to a length that is in the range of about one-half toabout one-eighth the original length of that portion of the sleeve, andin one exemplary embodiment it can compress to a length that is aboutone-fifth the original length of that portion of the sleeve. Thus, ifthe length of the sleeve disposed around the first limb is approximately3 centimeters, when fully compressed the sleeve can have a length thatis approximately 0.6 centimeters.

In some embodiments, a second suture filament can be associated with thebody of the implant to help guide or shuttle the filament during asurgical procedure. As shown in FIG. 10, an embodiment of an implant 500includes a body 410 having two thru-holes 424 formed therein and a firstsurgical filament 450 coupled thereto. In the illustrated embodiment,rather than having a knot formed on a top side 410 a of the body 410,limbs 454, 455 of the first surgical filament 450 are intertwined arounda mid-portion 450 m of the filament 450 on the top side 410 a, therebyforming an intertwining configuration 452. The first and second limbs454, 455 can also extend distally from the intertwining configuration452. More particularly, the limbs 454, 455 can extend through thethru-holes 424 a plurality of times to form a plurality of coils 460 a,460 b substantially disposed on a bottom side 410 b of the body 410. Thefriction resulting from the intertwining configuration 452 can besufficient to assist in retaining sizes and positions of the coils 460a, 460 b, and to minimize any slipping associated therewith.

A second suture filament or shuttle filament 490 can be disposedlongitudinally through the body as shown, for instance in a longitudinalbore 425 formed therethrough. The filament can extend substantiallyalong a central, longitudinal axis L of the body 410, and thus canextend through the thru-holes 424 formed in the body 410, resulting in aleading end 490 a and a trailing end 490 b. A knot 492 or otherprotrusion larger than a diameter of the longitudinal bore 425 can beformed in or otherwise located on the trailing end 490 b and can assistthe leading end 490 a and the trailing end 490 b in serving as a guideor shuttle for the implant 500, as described in greater detail belowwith respect to FIGS. 13A-13H. By using a single suture disposed throughthe longitudinal bore 425 to serve as a shuttle, the number of suturesused in the system can be reduced, thereby simplifying the procedurewithout diminishing the tactile feedback available to the surgeon oncethe body 410 has flipped on the femoral cortex.

Although the illustrated bore 425 extends through the body 410 andthrough each of the thru-holes 424, a person skilled in the art willrecognize other configurations that can be formed without departing fromthe spirit of the present disclosure, such as having the thru-holes 424situated off-center of the body 410 so they are not intersected by thebore 425, or the bore 425 having a path that does not necessarily extendthrough each thru-hole 424 or all the way through the body 424.Additionally, in some embodiments the longitudinal bore 425 can beformed with an invagination (not shown) on a trailing end 418 of thebody 410 such that it has a diameter that is approximately larger thanthe diameter of the bore 425 and approximately smaller than the diameterof the knot 492. As a result, the knot 492 can be partially fit insidethe body 410 and remain engaged with the body 410 even after the bodyhas been flipped onto the femoral cortex. Once the body 410 is rotatedthrough a specific angle, the knot 492 can disengage with theinvagination and the filament 490 can easily be removed from thepatient. A person having skill in the art will recognize that the sizeand depth of the invagination can control, at least in part, the releaseangle.

A person skilled in the art will recognize that one or more additionalfilaments, like the second filament 490, can be associated with avariety of implant configurations, including configurations describedherein or derivable therefrom. Two further non-limiting examples ofimplants having second suture filaments for shuttling are illustrated inFIGS. 11A and 11B and 12A and 12B.

The implant 600 of FIGS. 11A and 11B includes a body 510 having twothru-holes 524 formed therein and a first surgical filament 550 coupledthereto. The surgical filament 550 is similar to the surgical filament50 of FIG. 5 in that limbs 554, 555 of the filament 550 are used to forma self-locking knot 552 disposed on a top side 510 a of the body 510 andfour coils 560 a, 560 b, 560 c, and 560 d that pass through thethru-holes 524 and are substantially disposed on a bottom side 510 b ofthe body 510. First and second terminal ends 554 t, 555 t of the limbs554, 555 can extend proximally from the self-locking knot 552 and can beused at least to adjust sizes of the coils 560 a, 560 b, 560 c, and 560d in manners consistent with descriptions contained herein. A secondsuture filament or shuttle filament 590 can be disposed longitudinallythrough a longitudinal bore 525 formed in the body 510 along a central,longitudinal axis M, and thus can extend through the thru-holes 524formed in the body 510. Similar to the implant 500 of FIG. 10, a knot592 larger than a diameter of the longitudinal bore 525 can be formed ina trailing end 590 b of the second filament 590 and can assist a leadingend 590 a and the trailing end 590 b in serving as a guide or shuttlefor the implant 600.

The implant 700 of FIGS. 12A and 12B includes a body 610 having fourthru-holes 624 formed therein and a first surgical filament 650 coupledthereto. As shown, the four thru-holes 624 include two inner thru-holes624 b and 624 c that can be used to receive the filament 650 and twoouter thru-holes 624 a and 624 d that can be used to receive shuttlefilaments. As shown, the outer thru-holes 624 a, 624 d can be disposedcloser to leading and trailing ends 616 and 618, respectively, than tothe inner thru-holes 624 b and 624 c, and thus the four thru-holes 624are not approximately equally spaced apart with respect to each other.As also shown, diameters of the two inner holes 624 b and 624 c arelarger than diameters of the two outer holes 624 a and 624 d. Thesurgical filament 650 is similar to the surgical filament 50 of FIG. 5in that first and second limbs 654, 655 of the filament 650 are used toform a self-locking knot 652 disposed on a top side 610 a of the body610 and four coils 660 a, 660 b, 660 c, and 660 d that pass through thethru-holes 624 b, 624 c and are substantially disposed on a bottom side610 b of the body 610. First and second terminal ends 654 t, 655 t ofthe limbs 654, 655 can extend proximally from the self-locking knot 652and can be used at least to adjust sizes of the coils 660 a, 660 b, 660c, and 660 d in manners consistent with descriptions contained herein.As shown, a second, leading suture filament or leading shuttle filament690 can be disposed through the outer thru-hole 624 d and around theleading end 616, and a third, trailing shuttle filament 691 can bedisposed through the outer thru-hole 624 a and around the trailing end618. As described below with respect to aspects of FIGS. 13A-13H, theshuttle filaments 690 and 691 can serve as a guide or shuttle for theimplant 700 to assist in passing the implant 700 through a bone tunnel.

Similar to other filaments of the present disclosure, a shuttle filamentcan be an elongate filament of a variety of types, including but notlimited to a cannulated filament, a braided filament, and a monofilament. The type, size, and strength of the filament can depend, atleast in part, on the other materials of the implant, such as thecortical button, and the type of procedure in which it is used. In oneexemplary embodiment the second suture filament is formed from a #5filament (about 20 gauge to about 21 gauge. In some embodiments thefilament can have a size in the range of about a #2-0 filament (about 28gauge) and about a #5 filament (about 20 gauge to about 21 gauge). Alength of the filament can be in the range of about 0.1 meters to about1.5 meters, and in one embodiment the length is about 1 meter.

Different exemplary features associated with performing an ACL repairusing a surgical implant like those described herein are illustrated inFIGS. 13A-13H. The implant 800 illustrated in FIGS. 13A and 13D-Ggenerally includes thru-holes 724 (not shown) formed therein and a firstsurgical filament 750 coupled thereto. As shown, first and second limbs754, 755 (FIGS. 13F and 13G) of the first surgical filament 750 can beused to form a self-locking knot 752 disposed on a top side 710 a of thebody 710 and a plurality of coils—as shown two coils 760 a, 760 b, butany number of coils can be formed in accordance with the teachingsherein—that pass through the thru-holes 724 and are substantiallydisposed on a bottom side 710 b of the body. Extending proximally fromthe knot can be first and second terminal ends 754 t, 755 t of the limbs754, 755, which can be used at least to adjust sizes of the coils 760 a,760 b in manners consistent with descriptions contained herein. One ormore additional filaments can be associated with the leading and/ortrailing ends 716, 718 of the body 710. As shown, a second filament 790is associated with the leading end 716, and a third filament 791 isassociated with the trailing end 716. A graft 802 can be associated withthe coils 760 a, 760 b using techniques known to those skilled in theart.

A surgeon can begin the procedure by preparing the knee 1000 and softtissue tendon grafts using techniques known by those skilled in the art.As shown in FIG. 13A, a bone tunnel 1002 can be formed in a femur 1001and tibia 1003, with a femoral tunnel 1004 of the bone tunnel 1002including a main channel 1005 and a passing channel 1007, the passingchannel 1007 having a smaller diameter than the main channel 1005, andthe femoral tunnel 1004 being in direct communication with a tibialtunnel 1006 disposed in the tibia 1003. The implant 800 can beintroduced into the tibial tunnel 1006 by applying a force in anapproximate direction J to the second and third suture filaments 790,791, which both extend toward the femoral tunnel as shown. The terminalends 754 t, 755 t can also extend toward the femoral tunnel, such thatsix strands of suture all extend out of the femoral tunnel 1004,proximal of the bone tunnel 1002.

FIGS. 13B and 13C illustrate example orientations for implants 700 and600 of FIGS. 12A and 12B and FIGS. 11A and 11B, respectively, if theywere to be inserted into the bone tunnel 1002 in a manner similar to theimplant 800. As illustrated in FIG. 13B, all six terminal ends of thefilaments 650, 690, and 691 associated with the body 610 can extendproximally when inserted through the bone tunnel 1002 (not shown). Theseterminal ends include the first and second terminal ends 654 t, 655 t ofthe first filament 650, first and second terminal ends 689 t, 690 t ofthe leading shuttle filament 690, and first and second terminal ends 691t, 692 t of the trailing shuttle filament 692. Similarly, as illustratedin FIG. 13C, all four terminal ends of the filaments 550 and 590associated with the body 510 can extend proximally through the bonetunnel 1002 (not shown). These terminal ends include the first andsecond terminal ends 554 t, 555 t of the first filament 550 and firstand second terminal ends 589 t, 590 t of the shuttle filament 590.Grafts 702, 602 can be associated with coils 660, 550 of the implants700, 600 using techniques known to those skilled in the art. Further, aperson skilled in the art will recognize that as the implants 700, 600are inserted into the bone tunnel, filaments and grafts located on thetop and bottom sides 610 a, 510 a and 610 b, 510 b, respectively, can beflexible to allow the construct to be disposed in the tunnel, similar tothe implant 800 of FIG. 13A.

Turning back to the implant 800, as shown in FIG. 13D, a force in theapproximate direction J can be applied to terminal ends 790 t, 791 t ofthe second and third filaments 790, 791, as well as to the terminal ends754 t, 755 t of the first and second limbs 754, 755, to advance eachthrough the tibial tunnel 1006 and into the femoral tunnel 1004. Acounterforce can be applied to the graft 802 so that the entireconstruct is not fully inserted into the bone tunnel 1002, as inexemplary embodiments the graft 802 can be used to help orient thecortical button 710 with respect to the bone tunnel 1002. Further, asthe body 710 and coils 760 a, 760 b enter the bone tunnel 1002, care canbe taken to prevent the body 710 from becoming wrapped in the coils 760a, 760 b. Once the implant 800 enters the bone tunnel 1002, scopes canbe used to continue to monitor it. If the coils 760 a, 760 b undesirablywrap around the body 710, the surgeon can use instruments to unwrap thecoils 760 a, 760 b from the body 710 and/or the surgeon can selectivelyapply tension to the second and third suture filaments 790, 791 and thegraft 802 to manipulate the cortical button 710.

Continued application of the force in the approximate direction J canpull the body 710 through the passing channel 1007. As the body 710passes through the passing channel 1007 and crests while passing out ofthe channel, i.e., when a substantial portion of the body is disposedoutside of the channel, as shown in FIG. 13E, the surgeon can prepare toorient or manipulate the body so that it flips or changes orientation.Because tissue and ligaments can be located near the proximal end of thefemoral tunnel 1004, typically when cortical buttons pass out of afemoral tunnel, the extra tissue can make it difficult to direct thebutton to a desired location. However, the second and third filaments790, 791 can assist in manipulating the button 710 to a desired locationin which the flat bottom surface 720 rests on the femoral cortex andfaces the femoral tunnel 1004, as shown in FIG. 13F. This allows thecoils 760 a, 760 b and graft 802 associated therewith to be disposed inthe bone tunnel 1002 and the knot 752 to be located outside of butadjacent to the bone tunnel 1002.

A variety of techniques can be used to flip or reorient the button, butin the illustrated embodiment, shown in FIG. 13F, a force in anapproximate direction K is applied to the graft 802, thus tensioning thegraft and causing the button 710 to flip. In other embodiments, asurgeon can selectively apply tension to the graft 802 and the secondand third filaments 790, 791 to flip the button 710 to its desiredlocation. Once the surgeon has oriented the button 710 as desired, thesurgeon can confirm its location as lying flat on the femoral cortex,directly adjacent to the femoral tunnel 1004, using a variety oftechniques, including by using tactile feedback received from pullingthe second and third filaments 790, 791 and the graft 802, and/or usingvisual aids.

Once the body 710 is disposed at its desired location, tension can beapplied to the terminal ends 754 t, 755 t of the limbs 754, 755 toadjust the circumference of the coils 760 a, 760 b, thereby moving thegraft 802 within the bone tunnel 1002 to a desired location. Thecircumferences of the coils 760 a, 760 b can be adjusted using a numberof different techniques, including those described herein. In oneexemplary embodiment, illustrated in FIG. 13G, the first and secondterminal ends 754 t, 755 t can be selectively pulled in an approximatedirection N to advance the graft 802 through the tunnel 1002.

Once the implant 800 and graft 802 are positioned in their desiredlocations, excess filaments can be removed, including portions of theterminal ends 754 t, 755 t and the second and third filaments 790, 791.In some embodiments the second and third filaments can be completelyremoved, while care can be taken to ensure that enough material remainswith respect to the terminal ends 754 t, 755 t so as not to negativelyimpact the integrity of the knot 752. Then the remaining portions of therepair can be carried out, such as steps related to tibial fixation

FIG. 13H illustrates an embodiment of an ACL repair method in which afilament 750′ is used to form four coils 760 a′, 760 b′, 760 c′, 760 d′,two (760 a′, 760 c′) of which are associated with a first graft 802′ andtwo (760 b′, 760 d′) of which are associated with a second graft 804′.As shown in FIG. 13H, the cortical button 710′ is already oriented orflipped so that the top surface 720′ rests on the femoral cortex andfaces the femoral tunnel 1004, for instance relying on techniquesdisclosed herein, and thus circumferences of the coils 760 a′, 760 b′,760 c′, 760 d′ can be adjusted to selectively locate them within thebone tunnel 1002. These techniques include, for instance, thosediscussed above with respect to FIGS. 6A and 6B. In one exemplaryembodiment, tension can be alternately applied in an approximatedirection P to first and second terminal ends 754 t′, 755 t′ to advancethe grafts 802′, 804′ in increments of approximately 1 centimeter.Alternatively, the grafts 802′, 804′ can be advanced by using aconfiguration in which the first and second terminal ends 754 t′, 755 t′are tied together and held in one hand while tension in the approximatedirection Q is applied to the grafts 802′, 804′ by another hand. Thesurgeon can then alternate between pronation and supination to tightenthe filament limbs, and thereby the coils 760 a′, 760 b′, 760 c′, 760d′, which in turn advances the grafts 802′, 804′ proximally through thebone tunnel 1002.

The grafts 802′, 804′ can be advanced to a desired location, for exampleup to the passing channel 1007 of the femoral tunnel 1004. When a graft802′, 804′ reaches the passing channel 1007, typically the resistance totightening of the coils 760 a′, 760 b′, 760 c′, 760 d′ noticeablyincreases. In some embodiments, such as that illustrated in FIG. 13H,one or more loops 760 a′, 760 c′ can have a smaller circumference thanother loops 760 b′, 760 d′ so that one graft 802′ is more proximallylocated than the other graft 804′. As also illustrated in FIG. 13H, anyshuttle filaments used in the method can be removed, and the terminalends 754 t′, 755 t′ can be shortened as described herein.

A person skilled in the art will also recognize how other embodimentsdescribed herein or derivable therefrom can be easily adapted for usewith the procedures described herein, and in some instances can provideadditional benefits. By way of non-limiting example, for embodimentssuch as those illustrated in FIGS. 11A, 11B, and 13C in which a singlefilament is used for purposes of shuttling the body, removal of thefilament after placement of the cortical button can be easier than ifseparate filaments are tied to respective leading and trailing ends ofthe button.

The ability to control two independently tensioned ligament grafts in asingle tunnel using a single cortical button is an improvement overexisting techniques for ACL repairs. In existing methods for performingACL repairs, a cortical button having filament associated therewith canonly control a single bundle of ligament graft. Thus, if independentmovement of multiple ligaments is needed, each ligament is typicallyassociated with its own cortical button. Some surgeons use adouble-tunnel technique to implant two ligaments, thus fixing each graftbundle in separate tunnels. Double-tunnel techniques likewise requireone button per bundle. Thus, the methods described and resulting fromdisclosures herein represent improved ACL repair techniques because theyallow for two ligament bundles to be independently moved using a singlebutton, and doing so in a single tunnel. This results in procedures thathave a reduced risk of complications and is generally less complex thanexisting procedures. A person skilled in the art will recognize that thedisclosures pertaining to independently controlling two filament loopscan be broadly applied to a variety of implant designs and surgicalprocedures, and can even be applied to non-medical fields withoutdeparting from the spirit of the present disclosure.

One skilled in the art will appreciate further features and advantagesof the invention based on the above-described embodiments. Accordingly,the invention is not to be limited by what has been particularly shownand described, except as indicated by the appended claims. By way ofnon-limiting example, the exemplary ACL repair methods described hereinwith respect to FIGS. 13A-13H can be adapted for use with the otherimplant configurations described herein or derivable from thedisclosures herein. All publications and references cited herein areexpressly incorporated herein by reference in their entirety.

What is claimed is:
 1. A surgical method, comprising: loading a graftonto one or more coils of a plurality of coils of an implant filamentthat is coupled to an implant body, the implant filament forming asliding knot, and the implant body having a shuttle filament disposedtherethrough and two thru-holes each extending separate from the otherfrom a proximal surface of the implant body to a distal surface of theimplant body with the plurality of coils being disposed in each of thetwo thru-holes; pulling a leading end of the shuttle filament, and thusthe implant body, the implant filament, and the graft, through a bonetunnel until the implant body is pulled out of the tunnel while at leasta portion of the implant filament and the graft remain in the tunnel;and orienting the implant body so that the distal surface of the implantbody is facing the tunnel such that the plurality of coils are disposedsubstantially within the tunnel and the sliding knot and first andsecond terminal ends of the implant filament are outside of the tunnel,with the sliding knot being disposed on the proximal surface of theimplant body, and the proximal surface of the implant body being opposedto the distal surface of the implant body, wherein the plurality ofcoils comprise a first coil and a second coil formed by a first portionof the implant filament extending between the sliding knot and the firstterminal end, and a third coil and a fourth coil formed by a secondportion of the implant filament extending between the sliding knot andthe second terminal end, and wherein the plurality of coils are eachdisposed on the distal side of the implant body.
 2. The surgical methodof claim 1, further comprising: selectively applying tension to at leastone of the first and second terminal ends of the implant filament toadjust a circumference of one or more coils of the plurality of coils.3. The surgical method of claim 1, wherein the step of orienting theimplant body further comprises pulling a trailing end of the shuttlefilament.
 4. The surgical method of claim 1, wherein the step oforienting the implant body further comprises pulling both the leadingend of the shuttle filament and a trailing end of the shuttle filament.5. The surgical method of claim 4, wherein the step of orienting theimplant body by pulling both the leading end of the shuttle filament andthe trailing end of the shuttle filament occurs after the implant bodyis outside the bone tunnel to rotate the implant body such that a bottomsurface of the implant body is facing the bone tunnel.
 6. The surgicalmethod of claim 1, wherein the implant body includes a second shuttlefilament and the step of pulling the leading end of the shuttle filamentfurther includes pulling a leading end of the second shuttle filament.7. The surgical method of claim 6, wherein the implant body has a lengthand a width, the length being greater than the width, and wherein thesecond shuttle filament is disposed through the implant body at a secondlocation that is on an opposite end of the length of the body than thelocation of the shuttle filament.
 8. The surgical method of claim 1,wherein the sliding knot is a self-locking knot that includes the firstterminal end of the implant filament passed through a collapsibleopening of the self-locking knot from a first side of the opening and toa second side of the opening that is opposite the first side of theopening, and the second terminal end of the implant filament passedthrough the collapsible opening of the self-locking knot from the secondside of the opening and to the first side of the opening.
 9. Thesurgical method of claim 1, wherein each of the first, second, third,and fourth coils are disposed in each of the two thru-holes.
 10. Asurgical method, comprising: loading a graft onto at least one coil ofan implant filament that is coupled to an implant body that includes aplurality of apertures formed therein, the implant body having a shuttlefilament disposed therethrough, and the implant filament including aself-locking Lark's Head knot disposed on a side of the implant bodythat is opposed to a side of the implant body that faces the graftloaded onto the at least one coil; and pulling a leading end of theshuttle filament to pull the body, the implant filament, and the graftthrough a bone tunnel until the implant body is pulled out of the tunnelwhile at least a portion of the implant filament and the graft remain inthe tunnel, wherein the self-locking Lark's Head knot comprises: acollapsible opening formed by a portion of the implant filament beingfolded such that a first Limb of the implant filament extends from oneside of a fold location at which the implant filament is folded and asecond limb of the implant filament extends from an opposite side of thefold location, and the first and second limbs passing adjacent to thefold location such that a size of the collapsible opening changes as thefirst and second limbs move with, respect to the fold location, a firstterminal end of the first limb passed through the collapsible opening ofthe self-locking Lark's Head knot from a first side of the opening andto a second side of the opening that is opposite the first side of theopening, and a second terminal end of the second limb passed through thecollapsible opening of the self-locking Lark's Head knot from the secondside of the opening and to the first side of the opening, wherein eachof the first terminal end of the first limb and the second terminal endof the second limb is passed through two of the plurality of aperturesprior to passing the first and second terminal ends through thecollapsible opening.
 11. The surgical method of claim 10, furthercomprising: orienting the implant body so that a bottom side of theimplant body is facing the tunnel such that the at least one coil isdisposed substantially within the tunnel, and the self-locking Lark'sHead knot and first and second terminal ends of the implant filament areoutside of the tunnel.
 12. The surgical method of claim 11, wherein thestep of orienting the implant body further comprises pulling a trailingend of the shuttle filament.
 13. The surgical method of claim 11,wherein the step of orienting the implant body further comprises pullingboth the leading end of the shuttle filament and a trailing end of theshuttle filament.
 14. The surgical method of claim 10, wherein theimplant body includes a second shuttle filament and the step of pullingthe leading end of the shuttle filament further includes pulling aleading end of the second shuttle filament.
 15. The surgical method ofclaim 14, wherein the implant body has a length and a width, the lengthbeing greater than the width, and wherein the second shuttle filament isdisposed through the implant body at a second location that is on anopposite end of the length of the body than the location of the shuttlefilament.
 16. The surgical method of claim 10, wherein the at least onecoil comprises a first coil and a second coil formed by a first portionof the implant filament extending between the self-locking Lark's Headknot and the first terminal end, and a third coil and a fourth coilformed by a second portion of the suture filament extending between theself-locking Lark's Head knot and the second terminal end.
 17. Thesurgical method of claim 10, further comprising: selectively applyingtension to at least one of the first terminal end and the secondterminal end of the implant filament to adjust a circumference of one ormore coils of the plurality of coils.
 18. A surgical method, comprising:loading a graft onto one or more coils of a plurality of coils of animplant filament that is coupled to an implant body that includes aplurality of apertures formed therein, the implant filament forming asliding Lark's Head knot, the implant body having a length and a width,the length being greater than the width, a leading end of the implantbody at one end of the length, and a trailing end of the implant body isat the other end of the length, the implant body having a leadingfilament disposed through the leading end of the implant body and atrailing filament disposed through the trailing end of the implant body;pulling the leading filament and the trailing filament, and thus theimplant body, the implant filament, and the graft, through a bone tunneluntil the implant body is pulled out of the tunnel while at least aportion of the implant filament and the graft remain in the tunnel; andapplying tension to each of the leading filament, the trailing filament,and the graft to orient the implant body so that a bottom side of theimplant body is facing the tunnel such that the plurality of coils aredisposed substantially within the tunnel and the sliding Lark's Headknot and first and second terminal ends of the implant body are outsideof the tunnel, adjacent to a top side of the implant body, wherein thesliding Lark's Head knot comprises: a collapsible opening formed by aportion of the implant filament being folded such that a first limb ofthe implant filament extends from one side of a fold location at whichthe implant filament is folded and a second limb of the implant filamentextends from an opposite side of the fold location, and the first andsecond limbs passing adjacent to the fold location such that a size ofthe collapsible opening changes as the first and second limbs move withrespect to the fold location, a first terminal end of the first limbpassed through the collapsible opening of the sliding Lark's Head knotfrom a first side of the opening and to a second side of the openingthat is opposite the first side of the opening, and a second terminalend of the second limb passed through the collapsible opening of thesliding Lark's Head knot from the second side of the opening and to thefirst side of the opening, wherein each of the first terminal end of thefirst limb and the second terminal end of the second limb is passedthrough two of the plurality of apertures prior to passing the first andsecond terminal ends through the collapsible opening.
 19. The surgicalmethod of claim 18, further comprising: selectively applying tension toat least one of first and second terminal ends of the implant filamentto adjust a circumference of one or more coils of the plurality ofcoils.
 20. The surgical method of claim 18, wherein the plurality ofcoils comprise a first coil and a second coil formed by a first portionof the implant filament extending between the sliding Lark's Head knotand the first terminal end, and a third coil and a fourth coil formed bya second portion of the implant filament extending between the slidingLark's Head knot and the second terminal end, and wherein the pluralityof coils are each disposed on the bottom side of the implant body.